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    Bi-directional pattern dependent noise prediction
    2.
    发明授权
    Bi-directional pattern dependent noise prediction 有权
    双向模式相关噪声预测

    公开(公告)号：US08711661B2

    公开(公告)日：2014-04-29

    申请号：US13745297

    申请日：2013-01-18

    Applicant: Yibin Ng ,  Vijayakumar Bhagavatula ,  Kui Cai

    Inventor： Yibin Ng ,  Vijayakumar Bhagavatula ,  Kui Cai

    IPC: G11B11/00

    CPC classification number: G11B20/10398 ,  G11B20/10287 ,  G11B2220/2516

    Abstract: A method performed by a disk drive, comprising: receiving a plurality of signal samples over a channel in the disk drive; executing a forward pattern-dependent noise prediction (PDNP) operation on the plurality of the signal samples; generating, based on execution of the forward PDNP operation, a first detection of recorded data bits in the plurality of received signal samples; executing a backward PDNP operation on the plurality of the received signal samples; generating, based on execution of the backward PDNP operation, a second detection of recorded data bits in the plurality of received signal samples; comparing the first detection to the second detection; identifying, based on comparing, one or more erasures in the received plurality of signal samples; and generating one or more sequences of bits that promote correction of the one or more erasures.

    Abstract translation: 一种由磁盘驱动器执行的方法，包括：通过所述磁盘驱动器中的通道接收多个信号样本; 对所述多个所述信号样本执行正向模式相关噪声预测（PDNP）操作; 基于所述正向PDNP操作的执行，生成所述多个接收信号样本中的记录数据位的第一检测; 对所述多个接收信号样本执行反向PDNP操作; 基于所述后向PDNP操作的执行，生成所述多个接收信号样本中的记录数据位的第二检测; 将第一检测与第二检测进行比较; 基于比较识别所接收的多个信号样本中的一个或多个擦除; 以及生成促进所述一个或多个擦除的校正的一个或多个比特序列。

    Method and system for encoding and decoding information with modulation constraints and error control
    4.
    发明授权
    Method and system for encoding and decoding information with modulation constraints and error control 失效
    用调制约束和误差控制对信息进行编码和解码的方法和系统

    公开(公告)号：US08078935B2

    公开(公告)日：2011-12-13

    申请号：US11796094

    申请日：2004-10-26

    Applicant: Kui Cai ,  Kees A. Schouhamer Immink

    Inventor： Kui Cai ,  Kees A. Schouhamer Immink

    IPC: H03M13/00

    CPC classification number: G11B20/1833 ,  G11B20/10296 ,  G11B2020/1288 ,  G11B2220/2541 ,  H03M5/145 ,  H03M13/11 ,  H03M13/31

    Abstract: A method and system for encoding a segment of user data words into a segment of code words so that both modulation constraints and a predetermined parity-check constraint are satisfied. Each segment of the user data is partitioned into several data words, and encoded separately by first and second types of component code, which are referred to as the normal constrained code and the parity-related constrained code, respectively. The parity-check constraint over the combined code word is achieved by concatenating the sequence of normal constrained code words with a specific parity-related constrained code word chosen from a candidate code word set. Both the component codes are finite-state constrained codes, which are designed to have rates close to the Shannon capacity. Furthermore, they are based on the same finite state machine (FSM), which enables them to be connected seamlessly, without violating the modulation constraints. Two preferred embodiments are provided to design a code in the non-return-to-zero inverted (NRZI) format and the non-return-to-zero (NRZ) format, respectively. Designing the codes in NRZ format may reduce the number of parity-check bits required for error detection and simplify error correction or post-processing. The parity-check constraint is defined by the parity-check polynomial or parity-check matrix of a systematic linear block code, which could detect any type of dominant error event as well as error event combinations of a given optical recording system. As a result, the information density of the system is improved.

    Abstract translation: 一种用于将一段用户数据字编码成码字段的方法和系统，以便满足调制约束和预定奇偶校验约束。 用户数据的每个段被划分成几个数据字，并由分别被称为正常约束码和奇偶校验相关约束码的第一和第二类型的分量码分别编码。 组合码字中的奇偶校验约束通过将正常约束码字序列与从候选码字集合中选择的特定奇偶校验相关的约束码字连接来实现。 组件代码都是有限状态约束代码，其设计的速率接近香农容量。 此外，它们基于相同的有限状态机（FSM），使得它们能够无缝连接，而不会违反调制约束。 提供两个优选实施例来设计分别以非归零反转（NRZI）格式和非归零（NRZ）格式的代码。 以NRZ格式设计代码可能会减少错误检测所需的奇偶校验位的数量，并简化纠错或后处理。 奇偶校验约束由系统线性块码的奇偶校验多项式或奇偶校验矩阵定义，其可以检测任何类型的主要错误事件以及给定光学记录系统的错误事件组合。 结果，提高了系统的信息密度。

    Method And System For Encoding And Decoding Information With Modulation Constraints And Error Control
    5.
    发明申请
    Method And System For Encoding And Decoding Information With Modulation Constraints And Error Control 失效
    用调制约束和误差控制编码和解码信息的方法和系统

    公开(公告)号：US20080141095A1

    公开(公告)日：2008-06-12

    申请号：US11796094

    申请日：2004-10-26

    Applicant: Kui Cai ,  Kees A. Schouhamer Immink

    Inventor： Kui Cai ,  Kees A. Schouhamer Immink

    IPC: H03M13/13 ,  G06F11/10

    CPC classification number: G11B20/1833 ,  G11B20/10296 ,  G11B2020/1288 ,  G11B2220/2541 ,  H03M5/145 ,  H03M13/11 ,  H03M13/31

    Abstract: A method and system for encoding a segment of user data words into a segment of code words so that both modulation constraints and a predetermined parity-check constraint are satisfied. Each segment of the user data is partitioned into several data words, and encoded separately by first and second types of component code, which are referred to as the normal constrained code and the parity-related constrained code, respectively. The parity-check constraint over the combined code word is achieved by concatenating the sequence of normal constrained code words with a specific parity-related constrained code word chosen from a candidate code word set. Both the component codes are finite-state constrained codes, which are designed to have rates close to the Shannon capacity. Furthermore, they are based on the same finite state machine (FSM), which enables them to be connected seamlessly, without violating the modulation constraints. Two preferred embodiments are provided to design a code in the non-return-to-zero inverted (NRZI) format and the non-return-to-zero (NRZ) format, respectively. Designing the codes in NRZ format may reduce the number of parity-check bits required for error detection and simplify error correction or post-processing. The parity-check constraint is defined by the parity-check polynomial or parity-check matrix of a systematic linear block code, which could detect any type of dominant error event as well as error event combinations of a given optical recording system. As a result, the information density of the system is improved.

    Abstract translation: 一种用于将一段用户数据字编码成码字段的方法和系统，以便满足调制约束和预定奇偶校验约束。 用户数据的每个段被划分成几个数据字，并由分别被称为正常约束码和奇偶校验相关约束码的第一和第二类型的分量码分别编码。 组合码字中的奇偶校验约束通过将正常约束码字序列与从候选码字集合中选择的特定奇偶校验相关的约束码字连接来实现。 组件代码都是有限状态约束代码，其设计的速率接近香农容量。 此外，它们基于相同的有限状态机（FSM），使得它们能够无缝连接，而不会违反调制约束。 提供两个优选实施例来设计分别以非归零反转（NRZI）格式和非归零（NRZ）格式的代码。 以NRZ格式设计代码可能会减少错误检测所需的奇偶校验位的数量，并简化纠错或后处理。 奇偶校验约束由系统线性块码的奇偶校验多项式或奇偶校验矩阵定义，其可以检测任何类型的主要错误事件以及给定光学记录系统的错误事件组合。 结果，提高了系统的信息密度。

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